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Neuron-Derived Estrogen Regulates Synaptic Plasticity and Memory.

Yujiao Lu1, Gangadhara R Sareddy2, Jing Wang1

  • 1Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 8, 2019
PubMed
Summary
This summary is machine-generated.

Neuron-derived 17β-estradiol (E2) is crucial for brain synaptic plasticity and cognitive functions. Depleting E2 in forebrain neurons impairs memory and synaptic density, highlighting E2's role as a neuromodulator.

Keywords:
aromatasecerebral cortexcognitionestrogenhippocampussynapse

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Molecular Biology

Background:

  • 17β-estradiol (E2) is synthesized in the brain by aromatase in neurons, but its specific functions remain unclear.
  • Previous research has not fully elucidated the role of neuron-derived E2 in cognitive processes and synaptic function.

Purpose of the Study:

  • To investigate the precise functions of neuron-derived E2 in the forebrain.
  • To determine the impact of depleted neuron-derived E2 on synaptic plasticity, cognitive function, and related signaling pathways.

Main Methods:

  • Generation of a forebrain-neuron-specific aromatase knock-out (FBN-ARO-KO) mouse model.
  • Assessment of molecular changes (aromatase, E2 levels) and behavioral deficits (memory, anxiety, locomotion).
  • In vitro studies on hippocampal slices to evaluate long-term potentiation (LTP) and signaling pathways (AKT, ERK, CREB-BDNF).

Main Results:

  • FBN-ARO-KO mice exhibited significantly reduced forebrain aromatase and E2 levels.
  • Deficits were observed in spine/synaptic density and hippocampal-dependent memory tasks in FBN-ARO-KO mice.
  • LTP amplitude was decreased in FBN-ARO-KO hippocampal slices, with impaired AKT-ERK and CREB-BDNF signaling, which were rescued by E2 administration.

Conclusions:

  • Neuron-derived E2 plays a critical role in regulating synaptic plasticity and cognitive function in both male and female brains.
  • E2 acts as a neuromodulator, influencing rapid AKT-ERK and CREB-BDNF signaling pathways.
  • Targeting neuron-derived E2 may offer therapeutic potential for cognitive and synaptic dysfunction.